Another interesting tidbit that appeared in today's Railway Gazette International feed is the order "includes 50 electro-diesel sets and 15 diesel-battery sets, with the rest [8] being EPA Tier 4 compliant diesels capable of using biodiesel fuel. The batteries can be charged from regenerated braking energy, the diesel engine or an external supply.
There are options for up to 140 more trainsets and further maintenance agreements.
The trains are intended to operate on the Northeast Corridor and various state-supported routes including those in Maine, Massachusetts, New York, North Carolina, Oregon, Vermont, Virginia and Washington. Amtrak said it expects the increased capacity and ability to shorten trip times to increase ridership by more than 1·5 million passengers/year."
My guess is that the 8 pure diesel sets will go to Washington and Maine, the 15 diesel-battery sets will go to New York, with the 50 electro-diesel sets going to NEC. The dual mode capabilities should provide greatly increased reliability, allowing trains to keep moving in the event of catenary problems or diesel engine failure. I wonder whether the diesel-battery sets will have a pantograph to facilitate battery charging; I suspect not. Is the basis for the reduced trip time claim the elimination of engine changes at DC for trains to/from the South and at Albany for trains to/from the West?